Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1357ef322c9e151…

MALICIOUS

PDF

76.2 KB Created: 2021-04-23 03:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d101b55f07249bd60f12f57c4ad3829a SHA-1: 66590ffd330b32a541d3707fcd22e8134aed8e5a SHA-256: c1357ef322c9e1513f0f72fd5fb38090b296eff7c9618b7c64e76eef1bfe9501
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/strik?utm_term=can+you+learn+python+in+a+week PDF link annotation
    • http://tonimaxuta.iblogger.org/iceberg_theory_definition.pdfIn PDF document text
    • http://tututot.mygamesonline.org/dependent_prepositions_b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_60226d5d57c9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5fc7d4ab7207e.pdfIn PDF document text
    • http://patavitukazinaz.iblogger.org/ameda_breast_pump_finesse_manual.pdfIn PDF document text
    • http://xevojifixifepi.scienceontheweb.net/vocational_guidance_journal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ffbde6bd9957.pdfIn PDF document text
    • http://dezimazokuxulil.mygamesonline.org/90204577253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_5fda0e266eaf7.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/17314101955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_600eec0258ae9.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/38856534121.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9995c8d3-3445-43f8-aefb-b93f8dfa465c/philips_universal_remote_control_programming_instructions.pdfIn PDF document text
    • http://fikamax.epizy.com/chammak_challo_telugu_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a91d627-2036-4e53-901f-fa128bdf98ae/financial_modelling_courses_free.pdfIn PDF document text
    • http://pupukoxofamisa.rf.gd/college_algebra_and_trigonometry_lial_hornsby_schneider.pdfIn PDF document text
    • http://tamedigozetot.epizy.com/gemstones_of_the_world_download.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/sepositosisupezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c93afc-68d1-4e5e-a330-6e3562eac03b/kavizagevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c637c4a1-1e38-4267-bd47-435b2f2954e4/39249952973.pdfIn PDF document text
    • http://rewelasiv.rf.gd/adobe_reader_mac_os_high_sierra.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/how_many_magic_treehouse_books_are_there_in_all.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/74656040654.pdfIn PDF document text
    • http://xotopusedewix.myartsonline.com/77558525830.pdfIn PDF document text
    • http://gogawepidaru.rf.gd/78117749476.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 4892 bytes
SHA-256: 6ef1152ddeb2e79ff0a4f0521ae4d2cc339b1bd0cad38763895506899e40845f
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 10920 bytes
SHA-256: ead61b7abf55660e48441bbd9c1dc0ca4474605a459b9512c1d04d6f3366a9ed